Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86a0368a2e6823d…

MALICIOUS

PDF

80.5 KB Created: 2021-05-03 03:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1678f67922c892f2f5908ad908159629 SHA-1: 2431e30f2b9374a3b67b8fd3e6693c6b8d1eb844 SHA-256: d86a0368a2e6823d2580b41df0b2d02cae259254386b03f4eb2c76803c42e7ea
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'drum patterns', likely a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/strik?utm_term=how+to+create+drum+patterns PDF link annotation
    • https://cdn.sqhk.co/tedefoso/ggjha8g/zodiac_sign_fun_facts_taurus.pdfIn PDF document text
    • https://peziwavadeba.weebly.com/uploads/1/3/4/3/134313506/lorofusidazowegom.pdfIn PDF document text
    • https://pefuwopiluja.weebly.com/uploads/1/3/4/5/134592541/ca20ca9.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/texeled.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuburi/DjdjaKu/billie_eilish_lockscreen_wallpaper.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/54927084909.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikebepo/hjhjiXy/bemimuvasa.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekata/hgnIdjg/old_stick_shift_car_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_d97eccb08e3c4be3bd9cee71e624ed03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a11ca5e-2c2c-4b7d-92d8-7fbdf97f369d/90391707009.pdfIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_90634583e88640d9a8d791a35e44aac8.pdf?index=trueIn PDF document text
    • http://pevogikuxupeja.onlinewebshop.net/letodozidexupotubilopuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b29eae-fd10-4dbd-a2a4-99d2d38d88d1/46487501974.pdfIn PDF document text
    • https://0f3c41ac-de96-4ba7-a517-026d7435d592.filesusr.com/ugd/8631de_e33e450a33594d1bb02058d963084ff2.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_b737143aa950445cada350f1e5d442b1.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_ec5cfd1f8d8045569eac06cd2eb16a93.pdf?index=trueIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_cc72a263c3c44fec9205d02888f8ec2b.pdf?index=trueIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_2ab967f1b0cd4a90897e8dce670a3316.pdf?index=trueIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_0e2ff145ee2b42ab9ec1d9fbcc3559f1.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 5076 bytes
SHA-256: 4f4213bcbaa9095765f8c62f5abc7abd1a247035fec3b92b6944859b5a312067
font_01_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 11008 bytes
SHA-256: 15ec0cddd5438bacbf357027f10b158f54b0f050c9e83a40f58ac743b20f8b2d
font_02_sfnt_off000126cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333